CircuitMess-Ringo-firmware
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Power button mutes/unmutes in-progress calls
During a call, you can now press the power button to mute/unmute the call, this replaces the green phone icon with a red one with a strike-through when muted, and puts the original back when unmuted.
I looked up the muting AT command in both the SIM800 and SIM7600 manuals and it appears to be the same, however I could only test with with a SIM7600.
On further testing, this isn't complete as it works for outgoing calls, but not incoming calls.
Probably want to hold off on merging until I get it working the same for incoming soon.